Why such a strong effort? Your evidence, as it is, is substantive enough to warrant a full refund. If you make a claim, you will win. That's how it works.
With eBay and PayPal, the buyer wins 99.9% of the time in claims/disputes. Sellers are very easily shafted, especially if you file it as item not as described. "Sold as-is" doesn't mean crap.
You merely have to ship all of those fakes back to the seller after the claim is settled in your favor, and you're good.